This is a highly-capable and strong chassis for your next robotics research project! Chassis components are CNC machined from aircraft aluminum. Two 37mm DC gear motors are included with encoders to enable dead-reckoning. The 2WD chassis includes a caster wheel, which allows the robot to turn freely, and minimize battery usage.
Check out these great videos from the Dunwoody College of Technology, using these kits in their classes: https://youtube.com/playlist?list=PLFlX4XCBQ8BU64Fk19hf39j7qVeI2I2rQ
Photos show this chassis with the optional micro-switch active bumper, which can be attached the front of the chassis (not included).